The attractor of evaporating Reissner–Nordström black holes
Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, 180 Siwangting Road, 225002, Yangzhou City, Jiangsu Province, China
2 School of Aeronautics and Astronautics, Shanghai Jiao Tong University, 200240, Shanghai, China
Accepted: 8 December 2020
Published online: 8 January 2021
Hiscock and Weems showed that there is an attractor behavior in the evolution of asymptotically flat Reissner–Nordström black hole under Hawking evaporation. If the initial charge-to-mass ratio Q/M of the black hole is relatively small, then the ratio first increases until the black hole hits the attractor and then starts to discharge toward the Schwarzschild limit. Sufficiently charged black holes, on the other hand, simply discharge steadily toward the Schwarzschild limit. In this work, we further investigate the nature of the attractor and found that it is characterized by the mass loss rate being equal to the charge loss rate. The attractor is not necessarily related to the specific heat in a general evaporating black hole spacetime, but for the Reissner–Nordström case part of the attractor lies very close to the boundary of the region where specific heat changes sign.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021